CN104184159B - The cooperative scheduling strategy of polynary energy storage in light storage distributed micro-grid system - Google Patents

The cooperative scheduling strategy of polynary energy storage in light storage distributed micro-grid system Download PDF

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CN104184159B
CN104184159B CN201410301770.XA CN201410301770A CN104184159B CN 104184159 B CN104184159 B CN 104184159B CN 201410301770 A CN201410301770 A CN 201410301770A CN 104184159 B CN104184159 B CN 104184159B
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grid
power
accumulator
ultracapacitor
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CN104184159A (en
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戴学济
孙志强
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GUANGDONG YUANJING ENERGY Co Ltd
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GUANGDONG YUANJING ENERGY Co Ltd
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Abstract

The cooperative scheduling strategy of polynary energy storage in a kind of light storage distributed micro-grid system, the polynary energy storage stage type converter topologies being based on includes prime two-way DC/DC converter unit and rear class DC/AC converter unit.Accumulator, is connected with load and bulk power grid through LC wave filter by DC/AC converter unit with two-way DC/DC converter unit common DC bus with two-way DC/DC converter unit and super capacitor.To the method for polynary energy storage stage type current transformer cooperative scheduling it is: distributed light storage micro-grid system is under grid-connect mode, polynary energy storage stage type current transformer is carried out double-smoothing control, control energy-storage travelling wave tube and be used for smoothing photovoltaic output-power fluctuation, and according to ultracapacitor state-of-charge and storage battery charge state, respective filtering parameter is adjusted;Distributed light storage micro-grid system is in the case of off-network, and controlling energy-storage travelling wave tube provides voltage and frequency to support for distributed light storage micro-grid system, and distributed light storage micro-grid system is combined for load supplying;Described energy-storage travelling wave tube is accumulator and ultracapacitor.

Description

The cooperative scheduling strategy of polynary energy storage in light storage distributed micro-grid system
Technical field
The present invention relates to the polynary energy storage coordinated dispatching method of a kind of distributed light storage micro-grid system.
Background technology
Distributed grid-connected photovoltaic is near user, can solve user power utilization nearby, reduces the dependence that electrical network is powered by user, fall Low power network line is lost;And under proper condition, coordinate energy-storage system, in conjunction with coordination control strategy, electrical network shape can be departed from Become lonely net independent operating.
When distributed photovoltaic power generation is incorporated into the power networks, it is possible to use energy-storage system effectively reduces grid-connected photovoltaic power generation output-power fluctuation pair The negative effect that electrical network causes, ensures that photovoltaic generation is incorporated to normal grid reliably.Under islet operation pattern, utilize energy storage system The capability of fast response of system, can meet the quality of power supply requirement that microgrid runs, also farthest meet negative when load fluctuation The power demand of lotus., power-type energy storage device and energy type energy storage device are combined by power circuit meanwhile, coordinate association Adjust control strategy, form hybrid energy-storing, power-type energy storage device and energy type energy storage device can be made to realize having complementary advantages, promote The performance of energy-storage system, has higher using value in occasions such as solving regenerative resource fluctuation.
Domestic and foreign literature occurring, mixed energy storage system participates in stabilizing power swing under grid-connected conditions, under the conditions of off-network, participated in electricity The description of pressure FREQUENCY CONTROL, but does not propose a kind of that be applicable to mixed energy storage system, blanket in grid-connected and off-network Dispatching method.
Summary of the invention
It is an object of the invention to the shortcoming overcoming existing single batteries to store energy power density low, propose a kind of distributed light storage microgrid The cooperative scheduling strategy of polynary energy storage in system.The present invention is according to the advantage of different energy storage technologies, it is proposed that a kind of multi-source energy storage is used Stage type converter topology, form polynary energy-storage system by this topological structure, and propose cooperative scheduling strategy, make mixing store up Can system at distributed light storage micro-grid system also, preferably play a role under the conditions of off-network.Storage battery energy can be made full use of close The high complementary characteristic high with super capacitor power density of degree, optimizes the charge and discharge process of accumulator, extends its service life.
The present invention is by the following technical solutions:
Control method of the present invention polynary energy storage stage type current transformer based on distributed light storage micro-grid system.This polynary energy storage is with double The topological structure of level formula current transformer includes prime two-way DC/DC converter unit and rear class DC/AC converter unit.Accumulator is with double Jointly being connected on dc bus with two-way DC/DC converter unit to DC/DC converter unit and super capacitor, dc bus connects again To the DC side of DC/AC converter unit, it is connected with load and bulk power grid by LC wave filter.
Described ultracapacitor and accumulator constitute energy-storage travelling wave tube.The present invention polynary energy storage stage type current transformer cooperative scheduling side Method is: under distributed light storage micro-grid system grid-connect mode, described stage type current transformer carries out double-smoothing control, controls storage Can be used for smoothing photovoltaic output-power fluctuation by element, and according to ultracapacitor state-of-charge and storage battery charge state to respective Filtering parameter is adjusted.In the case of distributed light storage micro-grid system off-network, controlling energy-storage travelling wave tube is that the storage of distributed light is micro- Net system provides voltage and frequency to support, and distributed light storage micro-grid system is combined for load supplying.
Specific as follows:
(1) double-smoothing under distributed light storage micro-grid system grid-connect mode of the polynary energy storage stage type current transformer described in Control strategy is as follows:
Definition PpvFor photovoltaic system output.Wherein first heavily filter to improve the distributed light storage grid-connected power of micro-grid system Characteristic, can use low-pass first order filter to realize.This low-pass first order filter expression formula is:
P1=Ppv·T1
Wherein P1It is the first weight filtering output value, T1For this first weight filter parameter.
Output valve P that heavily will filter through low-pass first order filter first1The photovoltaic constituted as photovoltaic system and mixed energy storage system- The grid-connected power of hybrid energy-storing electricity generation system, even grid-connected power Pout=P1, the most grid-connected power PoutIt it is photovoltaic system output work The value that rate exports after low-pass filtering, its wave characteristic will be improved.Regulation the first weight filter parameter T1Can be to photovoltaic System output power wave characteristic is adjusted, the first weight filter parameter T1Reducing, the first weight filter cutoff frequency reduces, Grid-connected power is smooth-out;First weight filter parameter T1Increasing, the first weight filter cutoff frequency increases, grid-connected power waves Dynamic change is big.According to electrical network for the related request of photovoltaic electric station grid connection power swing, it may be determined that the first weight filter parameter T1 Maximum of T1maxWith minima T1min
Second heavily filtering, for realizing the power reasonable distribution between energy-storage travelling wave tube, heavily filters identical with first, and second heavily filters also Photovoltaic system output is carried out first-order low-pass ripple, and this second weight low-pass first order filter expression formula is:
P2=Ppv·T2
Wherein P2It is the second weight filtering output value, T2For this second weight filter parameter.
Second heavily filtering is, on the basis of first heavily filtering, energy-storage travelling wave tube is carried out power distribution, makes T2≥T1, make second heavily to filter Ripple output comprises more high fdrequency component, it is hereby achieved that ultracapacitor output reference valueFor:
P s c * = P p v - P 2
Owing to the output result that heavily filters first is as the grid-connected power of photovoltaic-hybrid energy-storing electricity generation system, therefore the first weight and Difference between the second double filtering of weight is the required low frequency part compensated in power, by the first weight and the second double filtering of weight it Between difference as accumulator compensate power set-point
P b a t * = P 1 - P 2
In sum, can be by regulation the second weight filter parameter T2Adjust the watt level that ultracapacitor undertakes, logical Overregulate the first weight filter parameter T1Adjust the watt level that accumulator undertakes.Work as T2=T1Time, the ginseng of double wave filter Number is identical, and ultracapacitor undertakes all power;As the second weight filter parameter T2When=1, the second weight wave filter lost efficacy, super Level capacitor does not undertake power, therefore the second weight filter parameter T2Range of accommodation be [T1,1]。
Under distributed light storage micro-grid system grid-connect mode, according to ultracapacitor state-of-charge and storage battery charge state to respective The strategy that filtering parameter is adjusted is as follows:
Known energy-storage travelling wave tube totally compensate power Phes=Ppv–Pout.The state-of-charge of energy-storage travelling wave tube is divided into five regions, for: 0~SOCmin, SOCmin~SOClow, SOClow~SOChigh, SOChigh~SOCmax, SOCmax~1.
1, according to ultracapacitor state-of-charge SOCscControl the discharge and recharge of ultracapacitor, the state-of-charge of ultracapacitor SOCscCan be obtained by the terminal voltage measuring super capacitor.
1) P is worked ashesWhen=0, ultracapacitor neither charges and does not discharges, and distributed light storage micro-grid system presses photovoltaic system output Power is to electrical network delivering power;
2) P is worked ashes> 0 time, ultracapacitor is in discharge condition, second weight filter parameter T2Regulation according to super capacitor The state-of-charge of device is divided into following several situation:
If 1. 0 < SOCsc<SOCmin, put phenomenon for preventing ultracapacitor from crossing and occur, now ultracapacitor only charges and does not puts Electricity, therefore the second weight filter parameter T2=1;
If 2. SOCmin≤SOCsc<SOClow, now ultracapacitor is in discharge capability deficiency, the shape that charging ability is had a surplus State, the second weight filter parameter T2Regulation become following relationship with state-of-charge:
T 2 = 1 - ( SOC s c - SOC min ) ( 1 - T 1 ) SOC l o w - SOC min
If 3. SOClow≤SOCsc< 1, at SOClow~SOChigh, SOChigh~SOCmax, SOCmax~1 these three pieces of district In territory, ultracapacitor is respectively provided with stronger discharge capability, and now ultracapacitor undertakes all power of energy-storage travelling wave tube, i.e. T2=T1
3) in like manner, P is worked ashes< when 0, ultracapacitor is in charged state, now the second weight filter parameter T2Regulation root State-of-charge SOC according to ultracapacitorscIt is also classified into following several situation:
If 1. 0 < SOCsc<SOChigh, 0~SOCmin, SOCmin~SOClow, SOClow~SOChighThese three pieces of districts Territory ultracapacitor is respectively provided with stronger charging ability, therefore T2=T1
If 2. SOChigh≤SOCsc<SOCmax, not enough at this regional Super capacitor charging ability, discharge capability is had a surplus, the Double filter parameter T2State-of-charge SOC according to super capacitorscChange by following rule:
T 2 = T 1 + ( SOC s c - SOC h i g h ) ( 1 - T 1 ) SOC max - SOC h i g h
If 3. SOCmax≤SOCsc< 1, occur for preventing ultracapacitor from overcharging phenomenon, now should forbid filling to ultracapacitor Electricity, therefore T2=1.
The first described weight wave filter is for regulating the grid-connected power of photovoltaic-hybrid energy-storing electricity generation system.
2, it is positioned at interval [SOC when the state-of-charge of ultracapacitorlow,SOChighTime outside], ultracapacitor face charging or The problem that discharge capability is not enough, now needs to utilize accumulator to supplement Partial Power.And if accumulator continuous discharge or charging, its State-of-charge also can tend to 0 or 1, now needs the state-of-charge SOC according to accumulatorbatRegulation the first weight filter parameter T1, Prevent from accumulator from overcharging or cross putting phenomenon.First weight filter parameter T1Regulation process the most following, second weight wave filter Parameter T2Regulation process and first weight filter parameter T1Regulation process be similar to.
1) P is worked ashesWhen=0, T1Constant.
2) P is worked ashes> 0 time, accumulator is in discharge condition, now T1Regulation according to storage battery charge state SOCbatPoint For following several situations, the state-of-charge of described accumulator obtains according to the charging and discharging currents of accumulator, uses special equipment permissible The state-of-charge of display accumulator in real time:
If 1. 0 < SOCbat<SOCmin, put phenomenon for preventing accumulator from crossing and occur, make T1=T1max;T1maxFor T1Maximum Value.
If 2. SOCmin≤SOCbat<SOClow, now battery discharging scarce capacity, T1According to storage battery charge state by such as Lower rule changes:
T 1 = T 1 m a x - ( SOC b a t - SOC m i n ) ( T 1 m a x - T 1 min ) ( SOC l o w - SOC m i n )
If 3. SOClow≤SOCbat< 1, at SOClow~SOChigh, SOChigh~SOCmax, SOCmax~1 these three district Territory, accumulator is respectively provided with stronger discharge capability, therefore T1=T1min。T1minFor T1Minima.
3) ibid, P is worked ashes< when 0, accumulator is in charged state, now to T1Regulation be divided into following several situation:
If 1. 0 < SOCbat<SOChigh, 0~SOCmin, SOCmin~SOClow, SOClow~SOChighThese three pieces of districts Territory accumulator is respectively provided with stronger charging ability, therefore T1=T1min;T1minFor T1Minima.
If 2. SOChigh≤SOCbat<SOCmax, not enough at this region accumulator charging ability, T1With storage battery charge state SOCbatOne-tenth following relationship:
T 1 = T 1 m i n + ( SOC b a t - SOC h i g h ) ( T 1 m a x - T 1 m i n ) ( SOC m a x - SOC h i g h )
If 3. SOCmax≤SOCbat< 1, for avoiding accumulator super-charge phenomenon to occur, now T1=T1max。T1maxFor T1's Maximum.
(2) during distributed light storage micro-grid system islet operation, as follows to the coordination control strategy of energy-storage travelling wave tube:
During distributed light storage micro-grid system islet operation, if between the output of photovoltaic system power and load during unbalanced power, institute In the polynary energy storage stage type current transformer stated, the DC bus-bar voltage being connected with rear class DC/AC converter unit can fluctuate. Owing to the ultracapacitor in the energy-storage travelling wave tube that accumulator and ultracapacitor form is power-type energy storage device, output changes Speed is fast, so now super capacitor uses DC bus-bar voltage outer shroud with two-way DC/DC converter unit, in charging and discharging currents The double-loop control strategy of ring, makes ultracapacitor preferential motion compensation power shortage, is adjusted DC bus-bar voltage simultaneously. Along with the carrying out of regulation, DC bus-bar voltage is gradually stabilized to reference value.But the energy density of ultracapacitor own is less, holds very much Easily reaching maximum or minimum limit value, therefore the present invention controls, by a PI, the load vacancy that ring progressively undertakes ultracapacitor It is transferred to accumulator, accumulator undertakes the compensation of load vacancy.When DC bus-bar voltage is stablized, ultracapacitor is no longer Output, the power shortage of the most distributed light storage micro-grid system net load is all compensated by accumulator, then piconet island is born only Lotus power is as follows:
Pnet-load=Pload-Ppv=Pbat
In formula, PloadFor load power, PbatFor accumulator output;
The power shortage of distributed light storage micro-grid system when if accumulator cannot all compensate islet operation, ultracapacitor just needs Undertake remaining power shortage, to ensure that the quality of power supply of distributed light storage micro-grid system requires and the power demand of load.
Ultracapacitor output PscWith ultracapacitor output reference valueDo difference, be distributed light and store up microgrid system System islet operation time instantaneous power vacancy, then by PI control ring regulation obtain distributed light storage micro-grid system isolated island under the conditions of Power shortage P when stablizingsyIf, PsyWithout departing from the power limit of accumulator, now the reference value of accumulator output with PsyEqual, if PsyBeyond the power limit of accumulator, accumulator output is higher limit or lower limit.Wherein energy storage Ultracapacitor output reference value in elementSize depend on that distributed light storage micro-grid system power when stablize is scarce Volume PsyHigher limit P with accumulator outputbat_max, lower limit Pbat_min, it may be assumed that
Work as Pbat_min≤Psy≤Pbat_maxTime, power shortage P when distributed light storage micro-grid system is stablizedsyWithout departing from accumulator The higher limit of output or lower limit, power shortage when the most distributed light storage micro-grid system is stablized all is supplied by accumulator, There is not dump power, super capacitor needs not participate in power adjustments, and now the power output reference value of super capacitor is:
P s c * = 0
Work as Psy< Pbat_min< 0 or Psy>Pbat_max> 0 time, distributed light storage micro-grid system power shortage when stablizing PsyBeyond higher limit or the lower limit of accumulator output, accumulator cannot be charged or discharge, the most distributed There is dump power in light storage micro-grid system, needs super capacitor to participate in power adjustments, compensate dump power, it may be assumed that
P s c * = P s y - ( P b a t _ m a x , P b a t _ m i n )
3, in sum, as follows to the control strategy of described polynary energy storage stage type current transformer:
When distributed light storage micro-grid system is incorporated into the power networks, to the accumulator of described polynary energy storage stage type current transformer with two-way DC/DC converter unit uses power to control with super capacitor with two-way DC/DC converter unit, single to the conversion of rear class DC/AC Unit uses DC bus-bar voltage outer shroud, the double-loop control strategy of grid-connected current internal ring.Concrete control flow is as follows: by dual The accumulator that filtering control strategy obtains compensates the set-point of powerWith ultracapacitor output reference valueIt is respectively divided by Accumulator and the terminal voltage of super capacitor, i.e. can get the watt current set-point of accumulatorMeritorious electricity with ultracapacitor Stream set-pointBy the watt current set-point of accumulatorWatt current set-point with ultracapacitorRespectively with actual measurement Accumulator cell charging and discharging electric current IbatSuper capacitor charging and discharging currents I with actual measurementscDo difference, after PI link regulates, then through PWM Modulation respectively obtains the switch letter of the two-way DC/DC converter unit of accumulator and the two-way DC/DC converter unit of super capacitor Number;The now effect of rear class DC/AC converter unit is the voltage controlling dc bus, and the command value of reactive power sets to 0.Directly The command value of stream busbar voltageWith actual value UdcDo after the recovery, obtain d axle watt current through pi regulator and gived Axle watt current givesAgain with actual d shaft current IdDo difference, again through uneoupled control after PI regulates, just obtain d Axle active voltage command valueReactive power setting herein is exactly directly the set-point of q shaft current, the set-point of q shaft current By with actual value IqDo difference, after PI, just obtain q axle reactive voltage command value through uneoupled control againDq shaft voltage Command value has obtained abc three-phase voltage reference wave after coordinate inverse transformation, after just can being controlled by SPWM algorithm The switching signal of level DC/AC converter unit switching tube.
Under the conditions of distributed light storage micro-grid system islet operation, it is still power control to accumulator with two-way DC/DC converter unit System, and use DC bus-bar voltage outer shroud, the double of charging and discharging currents internal ring to close with two-way DC/DC converter unit super capacitor Ring control strategy.Concrete control flow is as follows: gather DC bus-bar voltage actual value UdcWith DC bus-bar voltage command valueDo After the recovery, obtains the set-point of super capacitor charging and discharging currents through pi regulatorSet-point by super capacitor charging and discharging currentsSuper capacitor charging and discharging currents I with actual measurementscDo difference, after PI link, then obtain super capacitor with double through PWM Switching signal to DC/DC converter unit.Now rear class DC/AC converter unit uses V/f control strategy, and control method is Gather stage type current transformer load side voltage UL, component of voltage U under coordinate transform obtains dq coordinate axesLd、ULq, dq Component of voltage U under coordinate axesLd、ULqRespectively with ULd、ULqSet-point ULdref、ULqrefDo difference, through PI compensation tache Obtain current inner loop set-pointGather the LC wave filter used in stage type current transformer rear class DC/AC converter unit In filter inductance electric current i, the current component i under coordinate transform obtains dq coordinate axesd、iq, the electric current under dq coordinate axes divides Amount id、iqRespectively with current inner loop set-pointDo difference, through PI compensation tache and Feedforward Decoupling link, obtain voltage ginseng Examine valueThrough coordinate inverse transformation and PWM link, i.e. can obtain controlling rear class DC/AC converter unit switching tube Open cut-off signals, thus ensure that the constant of output voltage amplitude and frequency.
Accompanying drawing explanation
The topology diagram of Fig. 1 current transformer of the present invention;
Fig. 2 the second weight filter parameter T2Regulation flow chart;
Fig. 3 the first weight filter parameter T1Regulation flow chart;
Fig. 4 is incorporated into the power networks control strategy figure;
Fig. 5 islet operation control strategy figure.
Detailed description of the invention
Below in conjunction with figure, the invention will be further described with detailed description of the invention.
The topological structure of the polynary energy storage stage type current transformer that Fig. 1 is used by the inventive method.This polynary energy storage stage type Current transformer includes prime two-way DC/DC converter unit and rear class DC/AC converter unit.Accumulator converts with two-way DC/DC Unit and super capacitor two-way DC/DC converter unit common DC bus, accumulator are connected accumulator the most respectively with super capacitor With two-way DC/DC converter unit and the two-way DC/DC converter unit of super capacitor, then reconnect DC/AC converter unit, Connect ac bus by DC/AC converter unit, then be connected with load and bulk power grid through LC wave filter.
Fig. 2 is the second weight filter parameter T2Regulation flow chart, works as Phes> 0 time, ultracapacitor is in discharge condition, Double filter parameter T2Regulation according to super capacitor state-of-charge SOCscIt is divided into following several situation:
If 1. 0 < SOCsc<SOCmin, put phenomenon for preventing ultracapacitor from crossing and occur, now ultracapacitor only charges and does not puts Electricity, therefore T2=1;
If 2. SOCmin≤SOCsc<SOClow, now ultracapacitor is in discharge capability deficiency, the shape that charging ability is had a surplus State, T2Regulation become following relationship with state-of-charge:
T 2 = 1 - ( SOC s c - SOC min ) ( 1 - T 1 ) SOC l o w - SOC min
If 3. SOClow≤ SOCsc < 1, at SOClow~SOChigh, SOChigh~SOCmax, SOCmax~1 these three pieces of district Territory, ultracapacitor is respectively provided with stronger discharge capability, and now ultracapacitor undertakes all power of energy-storage travelling wave tube, i.e. T2= T1
Work as Phes< when 0, ultracapacitor is in charged state, now T2Regulation also divide according to ultracapacitor state-of-charge For following several situations:
If 1. 0 < SOCsc<SOChigh, 0~SOCmin, SOCmin~SOClow, SOClow~SOChighThese three pieces of districts Territory ultracapacitor is respectively provided with stronger charging ability, therefore T2=T1
If 2. SOChigh≤SOCsc<SOCmax, not enough at this regional Super capacitor charging ability, discharge capability is had a surplus, T2 Change by following rule according to ultracapacitor state-of-charge:
T 2 = T 1 + ( SOC s c - SOC h i g h ) ( 1 - T 1 ) SOC max - SOC h i g h
If 3. SOCmax≤SOCsc< 1, occur for preventing ultracapacitor from overcharging phenomenon, now should forbid to ultracapacitor Charging, therefore T2=1.
Fig. 3 is the first weight filter parameter T1Regulation flow chart.Work as Phes> 0 time, accumulator is in discharge condition, now T1 Regulation be divided into following several situation according to storage battery charge state:
If 1. 0 < SOCbat<SOCmin, put phenomenon for preventing accumulator from crossing and occur, make T1=T1max;T1maxFor T1Maximum Value.
If 2. SOCmin≤SOCbat<SOClow, now battery discharging scarce capacity, T1According to storage battery charge state by such as Lower rule changes:
T 1 = T 1 m a x - ( SOC b a t - SOC m i n ) ( T 1 max - T 1 min ) ( SOC l o w - SOC m i n )
If 3. SOClow≤SOCbat< 1, at SOClow~SOChigh, SOChigh~SOCmax, SOCmax~1 these three district Territory, accumulator is respectively provided with stronger discharge capability, therefore T1=T1min。T1minFor T1Minima.
Work as Phes< when 0, accumulator is in charged state, now to T1Regulation be divided into following several situation:
If 1. 0 < SOCbat<SOChigh, 0~SOCmin, SOCmin~SOClow, SOClow~SOChighThese three pieces of districts Territory accumulator is respectively provided with stronger charging ability, therefore T1=T1min;T1minFor T1Minima.
If 2. SOChigh≤SOCbat<SOCmax, not enough at this region accumulator charging ability, T1Following pass is become with state-of-charge System:
T 1 = T 1 m i n + ( SOC b a t - SOC h i g h ) ( T 1 m a x - T 1 m i n ) ( SOC m a x - SOC h i g h )
If 3. SOCmax≤SOCbat< 1, for avoiding accumulator super-charge phenomenon to occur, now T1=T1max。T1maxFor T1's Maximum.
Fig. 4 is the control strategy figure that distributed light stores up when micro-grid system is incorporated into the power networks to polynary energy storage stage type current transformer.Such as Fig. 4 Shown in, by the output reference value of the accumulator obtained by double-smoothing control strategy and ultracapacitorWithRespectively Divided by the terminal voltage of accumulator Yu super capacitor, i.e. can get watt current set-pointWithBy the watt current of accumulator Set-pointWatt current set-point with ultracapacitorRespectively with the accumulator cell charging and discharging electric current I surveyedbatWith actual measurement Super capacitor charging and discharging currents IscDo difference, after PI link, then respectively obtain accumulator through PWM and convert with two-way DC/DC Unit and the super capacitor switching signal of two-way DC/DC converter unit;The now effect of rear class DC/AC converter unit is controlled exactly The voltage of dc bus processed, the command value of reactive power sets to 0.The command value of DC bus-bar voltageWith actual value UdcDo after the recovery, Obtain d axle watt current through pi regulator to giveD axle watt current givesAgain with actual d shaft current IdDo difference, through PI Again through uneoupled control after regulation, just obtain d axle active voltage command valueIt is exactly directly q axle electricity that reactive power herein sets The set-point of stream, by q shaft current set-point and actual value IqDoing difference, after PI, then it is idle just to have obtained q axle through uneoupled control Voltage instruction valueDq shaft voltage command value has obtained abc three-phase voltage reference wave after coordinate inverse transformation, passes through SPWM Algorithm can be obtained by controlling the switching signal of rear class DC/AC converter unit.
Fig. 5 is that distributed light storage micro-grid system islet operation is to polynary energy storage stage type current transformer control strategy figure.Concrete control Flow process is as follows: as it is shown in figure 5, gather DC bus-bar voltage actual value UdcWith command valueDo after the recovery, obtain through pi regulator The set-point of super capacitor charging and discharging currentsSet-point by super capacitor charging and discharging currentsFill with the super capacitor of actual measurement Discharge current IscDo difference, after PI link, then obtain the switch letter of the two-way DC/DC converter unit of super capacitor through PWM Number.Now rear class DC/AC converter unit uses V/f control strategy, and control flow is for gathering load side voltage UL, through coordinate Conversion obtains the component of voltage U under dq coordinate axesLd、ULq, component of voltage U under dq coordinate axesLd、ULqRespectively with set-point ULdref、ULqrefDo difference, obtain current inner loop set-point through PI compensation tacheGather filter inductance electric current i, through coordinate Conversion obtains the current component i under dq coordinate axesd、iq, current component i under dq coordinate axesd、iqRespectively withDo difference, warp Cross PI compensation tache and Feedforward Decoupling link, obtain voltage reference valueVoltage reference valueThrough coordinate inverse transformation and PWM link, i.e. can get rear class DC/AC converter unit switching tube opens cut-off signals, with this Signal-controlled switch Pipe thus ensure that the constant of output voltage amplitude and frequency.

Claims (4)

1. a cooperative scheduling strategy for polynary energy storage, the polynary energy storage stage type being based in light storage distributed micro-grid system Converter topologies includes prime two-way DC/DC converter unit and rear class DC/AC converter unit;Accumulator is with two-way DC/DC converter unit and super capacitor are with two-way DC/DC converter unit common DC bus, then single by DC/AC conversion Unit is connected with load and bulk power grid through LC wave filter, it is characterised in that work in coordination with described polynary energy storage stage type current transformer The method of scheduling is: described polynary energy storage stage type current transformer, under grid-connect mode, is carried out by light storage distributed micro-grid system Double-smoothing controls, and controls energy-storage travelling wave tube and is used for smoothing photovoltaic output-power fluctuation, and according to ultracapacitor state-of-charge and storage Respective filtering parameter is adjusted by battery charge state;Light storage distributed micro-grid system, in the case of off-network, controls energy storage unit Part provides voltage and frequency to support for light storage distributed micro-grid system, and light storage distributed micro-grid system is combined for load supplying;Described Energy-storage travelling wave tube be accumulator and ultracapacitor;
The double-smoothing of polynary energy storage stage type current transformer is controlled under grid-connect mode by described light storage distributed micro-grid system Strategy is:
1) first heavily filter to improve system grid connection power characteristic, use low-pass first order filter filtering, first-order low-pass ripple Device expression formula is:
P1=Ppv·T1
Wherein: PpvFor photovoltaic system output, P1It is the first weight filtering output value, T1For this first weight filter parameter;
By the first weight filtering output value P1Photovoltaic-hybrid energy-storing electricity generation system as photovoltaic system and mixed energy storage system composition Grid-connected power, even Pout=P1, the most grid-connected power PoutIt is photovoltaic system output value after low-pass filtering, photovoltaic The wave characteristic of system is improved;
Regulation the first weight filter parameter T1Photovoltaic system output-power fluctuation characteristic is adjusted: T1Reducing, first heavily filters Ripple device cut-off frequency reduces, and grid-connected power is smooth-out;T1Increasing, the first weight filter cutoff frequency increases, grid-connected power waves Dynamic change is big;
2) the second heavily filtering realizes the power distribution between energy-storage travelling wave tube, heavily filters identical with first, and second heavily filters also to light Volt system output power carries out first-order low-pass ripple, and this second weight low-pass first order filter expression formula is:
P2=Ppv·T2
Wherein: PpvFor photovoltaic system output, P2It is the second weight filtering output value, T2It it is the second weight filter parameter;
Second heavily filtering be first heavily filtering on the basis of to energy-storage travelling wave tube between carry out power distribution, make T2≥T1, make second Heavily filtering output comprises more high fdrequency component, thus obtain ultracapacitor output reference valueFor:
P s c * = P p v - P 2
Output result owing to heavily filtering first stores up the grid-connected power of distributed micro-grid system, therefore the first weight and the second weight as light Difference between double filtering is the required low frequency part compensated in power, and as accumulator, this difference is compensated the given of power Value
P b a t * = P 1 - P 2
Therefore, it is possible to by regulation T2Adjust the watt level that ultracapacitor undertakes, by regulation T1Adjust accumulator to hold The watt level of load;Work as T2=T1Time, double filtering is consistent, and ultracapacitor undertakes all power;Work as T2When=1, filtering Device lost efficacy, and ultracapacitor does not undertake power, therefore T2Range of accommodation be [T1,1];
Described light storage distributed micro-grid system is in the case of off-network, and controlling energy-storage travelling wave tube provides electricity for light storage distributed micro-grid system The method that pressure and frequency support is as follows:
During light storage distributed micro-grid system islet operation, if unbalanced power between the output of photovoltaic system power and load, described Polynary energy storage stage type current transformer in, the DC bus-bar voltage being connected with rear class DC/AC converter unit can fluctuate; Now super capacitor uses DC bus-bar voltage outer shroud, the two close cycles control of charging and discharging currents internal ring with two-way DC/DC converter unit System strategy, makes ultracapacitor preferential motion compensation power shortage, is adjusted DC bus-bar voltage simultaneously;Along with regulation Carrying out, DC bus-bar voltage is gradually stabilized to reference value;Ring is controlled progressively bearing that super capacitor undertakes now by a PI Lotus vacancy is transferred to accumulator, accumulator undertake the compensation of load vacancy;When DC bus-bar voltage is stablized, super capacitor Device no longer output, the power shortage of this time storage distributed micro-grid system net load is all compensated by accumulator, then microgrid is lonely Island net load power Pnet-loadFor:
Pnet-load=Pload-Ppv=Pbat
In formula, PloadFor load power, PbatFor accumulator output;
If accumulator cannot all compensate the power shortage of islet operation time storage distributed micro-grid system, ultracapacitor needs Undertake remaining power shortage, to ensure that the quality of power supply of light storage distributed micro-grid system requires and the power demand of load;
Ultracapacitor output PscWith ultracapacitor output reference valueDo difference, be light and store up distributed micro-grid system System islet operation time instantaneous power vacancy, then by PI control ring regulation obtain light storage distributed micro-grid system isolated island under the conditions of Power shortage P when stablizingsyIf, described power shortage PsyWithout departing from the power limit of accumulator, now accumulator output The reference value of power and described power shortage PsyEqual, if described power shortage PsyBeyond the power limit of accumulator, Accumulator output is higher limit or lower limit;Ultracapacitor output reference valueSize depend on light storage distributed Power shortage P when micro-grid system is stablizedsyHigher limit P with accumulator outputbat_max, lower limit Pbat_min, it may be assumed that
Work as Pbat_min≤Psy≤Pbat_maxTime, power shortage P when light storage distributed micro-grid system is stablizedsyWithout departing from accumulator The higher limit of output or lower limit, power shortage when i.e. light storage distributed micro-grid system is stablized all is supplied by accumulator, There is not dump power, ultracapacitor needs not participate in power adjustments, and now ultracapacitor output reference value is:
P s c * = 0
Work as Psy< Pbat_min< 0 or Psy>Pbat_max> 0 time, light storage distributed micro-grid system power shortage when stablizing PsyBeyond higher limit or the lower limit of accumulator output, accumulator cannot be charged or discharge, the storage point of this time There is dump power in cloth micro-grid system, needs ultracapacitor to participate in power adjustments, compensate dump power, it may be assumed that
P s c * = P s y - ( P b a t _ m a x , P b a t _ m i n ) .
The cooperative scheduling strategy of polynary energy storage in light the most according to claim 1 storage distributed micro-grid system, its feature exists In, under described light storage distributed micro-grid system grid-connect mode, according to ultracapacitor state-of-charge and storage battery charge state pair The strategy that respective filtering parameter is adjusted is as follows:
Known energy-storage travelling wave tube totally compensate power Phes=Ppv–Pout, the state-of-charge of energy-storage travelling wave tube is divided into five regions:
0~SOCmin, SOCmin~SOClow, SOClow~SOChigh, SOChigh~SOCmax, SOCmax~1;
(1) according to ultracapacitor state-of-charge SOCscControl the discharge and recharge of ultracapacitor, the charged shape of ultracapacitor State SOCscObtained by the terminal voltage measuring super capacitor:
1) P is worked ashesWhen=0, ultracapacitor neither charges and does not discharges, and light storage distributed micro-grid system presses photovoltaic system output Power is to electrical network delivering power;
2) P is worked ashes> 0 time, ultracapacitor is in discharge condition, second weight filter parameter T2Regulation according to super capacitor The state-of-charge of device is divided into following several situation:
If 1. 0 < SOCsc<SOCmin, put phenomenon for preventing ultracapacitor from crossing and occur, now ultracapacitor only charges and does not puts Electricity, therefore the second weight filter parameter T2=1;
If 2. SOCmin≤SOCsc<SOClow, now ultracapacitor is in discharge capability deficiency, the shape that charging ability is had a surplus State, the second weight filter parameter T2Regulation become following relationship with state-of-charge:
T 2 = 1 - ( SOC s c - SOC min ) ( 1 - T 1 ) SOC l o w - SOC min
If 3. SOClow≤SOCsc< 1, at SOClow~SOChigh, SOChigh~SOCmax, SOCmax~1 these three pieces of district In territory, ultracapacitor is respectively provided with stronger discharge capability, and now ultracapacitor undertakes all power of energy-storage travelling wave tube, i.e. T2=T1
3) in like manner, P is worked ashes< when 0, ultracapacitor is in charged state, now the second weight filter parameter T2Regulation root State-of-charge SOC according to ultracapacitorscIt is divided into following several situation:
If 1. 0 < SOCsc<SOChigh, 0~SOCmin, SOCmin~SOClow, SOClow~SOChighThese three pieces of districts Territory ultracapacitor is respectively provided with stronger charging ability, therefore T2=T1
If 2. SOChigh≤SOCsc<SOCmax, not enough at this regional Super capacitor charging ability, discharge capability is had a surplus, the Double filter parameter T2State-of-charge SOC according to super capacitorscChange by following rule:
T 2 = T 1 + ( SOC s c - SOC h i g h ) ( 1 - T 1 ) SOC max - SOC h i g h
If 3. SOCmax≤SOCsc< 1, occur for preventing ultracapacitor from overcharging phenomenon, now should forbid to ultracapacitor Charging, therefore T2=1;
(2) it is positioned at interval [SOC when the state-of-charge of ultracapacitorlow,SOChighTime outside], ultracapacitor faces charging Or the problem that discharge capability is not enough, now need to utilize accumulator to supplement Partial Power;If accumulator continuous discharge or charging, its State-of-charge also can tend to 0 or 1, now needs the state-of-charge SOC according to accumulatorbatRegulation the first weight filtering parameter device T1, Prevent from accumulator from overcharging or cross putting phenomenon;First weight filter parameter T1Regulation process as follows, second weight wave filter ginseng Number T2Regulation process with first weight filter parameter T1Regulation process be similar to:
1) P is worked ashesWhen=0, T1Constant;
2) P is worked ashes> 0 time, accumulator is in discharge condition, now T1Regulation be divided into following several situation according to state-of-charge:
If 1. 0 < SOCbat<SOCmin, put phenomenon for preventing accumulator from crossing and occur, make T1=T1max;T1maxFor T1Maximum Value;
If 2. SOCmin≤SOCbat<SOClow, now battery discharging scarce capacity, according to storage battery charge state T1By such as Lower rule changes:
T 1 = T 1 m a x - ( SOC b a t - SOC m i n ) ( T 1 m a x - T 1 m i n ) ( SOC l o w - SOC m i n )
If 3. SOClow≤SOCbat< 1, at SOClow~SOChigh, SOChigh~SOCmax, SOCmax~1 these three district Territory, accumulator is respectively provided with stronger discharge capability, therefore T1=T1min;T1minFor T1Minima;
3) ibid, P is worked ashes< when 0, accumulator is in charged state, now to T1Regulation be divided into following several situation:
If 1. 0 < SOCbat<SOChigh, 0~SOCmin, SOCmin~SOClow, SOClow~SOChighThese three pieces of districts Territory accumulator is respectively provided with stronger charging ability, therefore T1=T1min;T1minFor T1Minima;
If 2. SOChigh≤SOCbat<SOCmax, not enough at this region accumulator charging ability, T1With storage battery charge state SOCbatOne-tenth following relationship:
T 1 = T 1 m i n + ( SOC b a t - SOC h i g h ) ( T 1 m a x - T 1 m i n ) ( SOC m a x - SOC h i g h )
If 3. SOCmax≤SOCbat< 1, for avoiding accumulator super-charge phenomenon to occur, now T1=T1max, T1maxFor T1's Maximum.
The cooperative scheduling strategy of polynary energy storage in light the most according to claim 1 storage distributed micro-grid system, its feature exists In, to described light storage distributed micro-grid system when being incorporated into the power networks control strategy to realize process as follows:
Accumulator and super capacitor to polynary energy storage stage type current transformer all use power control with two-way DC/DC converter unit System, rear class DC/AC converter unit uses DC bus-bar voltage outer shroud, the double-loop control strategy of grid-connected current internal ring;Specifically Control flow is as follows:
The accumulator obtained by double-smoothing control strategy compensates the set-point of powerWith ultracapacitor output reference ValueIt is respectively divided by the terminal voltage of accumulator and super capacitor, i.e. can get the watt current offset of accumulatorWith super electricity The watt current set-point of containerBy the watt current offset of accumulatorAccumulator cell charging and discharging electric current I with actual measurementbat Do difference, by the watt current set-point of ultracapacitorSuper capacitor charging and discharging currents I with actual measurementscDo difference, through PI link After, then respectively obtain the two-way DC/DC converter unit of accumulator and super capacitor through PWM and convert with two-way DC/DC The switching signal of unit;The now effect of rear class DC/AC converter unit is the voltage controlling dc bus, the finger of reactive power Value is made to set to 0;The command value of DC bus-bar voltageWith actual value UdcDo after the recovery and obtain d axle watt current through pi regulator GivenAgain with actual d shaft current IdDo difference, again through uneoupled control after PI regulates, obtain the instruction of d axle active voltage ValueReactive power setting is the set-point of q shaft current, the set-point of q shaft current and actual value IqDo difference, after PI Q axle reactive voltage command value is obtained again through uneoupled controlDq shaft voltage command value obtains abc tri-after coordinate inverse transformation Phase voltage reference wave, obtains controlling the switching signal of rear class DC/AC converter unit by SPWM algorithm.
The cooperative scheduling strategy of polynary energy storage in light the most according to claim 1 storage distributed micro-grid system, its feature exists In, to described light storage distributed micro-grid system in the case of off-network control strategy to realize process as follows:
Under the conditions of light storage distributed micro-grid system islet operation, to the accumulator of polynary energy storage stage type current transformer with two-way DC/DC converter unit still for power control, to super capacitor with two-way DC/DC converter unit employing DC bus-bar voltage outer shroud, The double-loop control strategy of charging and discharging currents internal ring, concrete control flow is as follows:
Gather DC bus-bar voltage actual value UdcWith command valueDo after the recovery, obtain ultracapacitor charge and discharge through pi regulator The set-point of electricity electric currentSet-point by ultracapacitor charging and discharging currentsSuper capacitor charging and discharging currents I with actual measurementsc Do difference, after PI link, then through PWM, obtain the super capacitor switching signal with two-way DC/DC converter unit; Now rear class DC/AC converter unit being used V/f control strategy, control flow is: gather load side voltage UL, through sitting Mark conversion obtains the component of voltage U under dq coordinate axesLd、ULq, component of voltage U under dq coordinate axesLd、ULqRespectively with ULd、 ULqSet-point ULdref、ULqrefDo difference, obtain current inner loop set-point through PI compensation tacheGather filter inductance Electric current i, the current component i under coordinate transform obtains dq coordinate axesd、iq, current component i under dq coordinate axesd、iqRespectively With current inner loop set-pointDo difference, through PI compensation tache and Feedforward Decoupling link, obtain voltage reference value Through coordinate inverse transformation and PWM link, i.e. can get rear class DC/AC converter unit switching tube opens cut-off signals, Thus ensure that the constant of output voltage amplitude and frequency.
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